Describe the factors that lead to muscle fatigue
What will be an ideal response
Although the precise mechanisms that cause muscle fatigue are still not clear, several factors are thought to contribute. One is inadequate release of calcium ions from the SR, resulting in a decline of Ca2+ concentration in the sarcoplasm. Depletion of creatine phosphate also is associated with fatigue, but surprisingly, the ATP levels in fatigued muscle often are not much lower than those in resting muscle. Other factors that contribute to muscle fatigue include insufficient oxygen, depletion of glycogen and other nutrients, buildup of lactic acid and ADP, and failure of action potentials in the motor neuron to release enough acetylcholine.
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The internal thoracic artery will become the ________, which carries blood to the superior abdominal wall.
A. inferior epigastric artery B. anterior intercostal arteries C. superior epigastric artery D. musculophrenic artery
For elbow flexion,
A. biceps brachii is the agonist and triceps brachii is the antagonist. B. biceps brachii is the antagonist and triceps brachii is the agonist. C. triceps brachii is the synergist and biceps brachii is the antagonist. D. deltoid is the agonist and biceps brachii is the synergist. E. biceps brachii is the synergist and triceps brachii is the agonist.
Which of the following is not true of a hydrocele?
A) It can be distinguished from a hematocele by transillumination. B) It is typically associated with a direct inguinal hernia. C) It refers to excess fluid in a persistent processus vaginalis. D) It may be confined to the spermatic cord. E) It may be associated with inflammation of the epididymis.
Which type of cone responds to short wavelengths of 420 nm?
A. Green cones B. Blue cones C. Red cones